# 画凸形
from turtle import *

forward(50)
left(90)
forward(50)
right(90)
forward(50)
left(90)
forward(50)
right(90)
forward(50)
right(90)
forward(50)
left(90)
forward(50)
right(90)
forward(50)
left(90)
forward(50)

done()